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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8550313c26fc90326580e6ba2f208532a0c706d77d854042f69489b5d3fabe' 
  AND token = 'rBKFW8Se894bJTBaWhRfJ/QqaabsV+823rrMeOUC2z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}